Get files of specific type using node

getFileType.js

const promisify = require('util').promisify;
const path = require('path');


// @param: fileType - the file extension you are searching for
// @param: filePath - the path to directory you would like to search. Defaults to __dirname
// @returns: <Promise> which will eventually resolve to an array with either the files names or empty
const getFileType = (fileType, filePath = './') => {
  const match = '([a-zA-Z0-9\\s_\\.\\-():])+(';
  const regEx = new RegExp(match + fileType + ')$', 'i');
  const fsReadDir = promisify(fs.readdir);
  const directoryPath = path.resolve(__dirname, filePath);;
  return fsReadDir(directoryPath).then(files => files.filter(file => file.match(regEx)));
};